This high accuracy, direct drive, XY gantry is for additive manufacturing, laser processing, or optical inspection. Enclosed stages with air purge and special connectors resist particulate intrusion. High accuracy ball-screw Z-axis includes a linear encoder for excellent accuracy and repeatability. The system includes a sealed rotary axis in granite sidewalls for tilting/rotating parts below the gantry. Air-isolated granite minimizes floor vibrations from disturbing system performance.